Attic Tips I’m interested in blown-in fiberglass and radiant barrier. How much insulation do I need on the floor of the attic, and what is the difference between foil and paint radiant barriers? Jodi — Listen to Tom’s answer: https://media.blubrry.com/homeshow/p/homeshowradio.com/wp-content/uploads/2011/09/Joni.mp3Podcast: Play in new window Got a question? Click here to ask Tom More HomeShow Videos:Attic Ventilation OptionsHow can I cool off an attic loft if we don't have…What's the right attic ventilation option for a roof…What can we do about an attic that can’t breathe?Why is my attic making more noise since I got ridge vents?